I believe the Rx 'on chip' inertia ramps between 0 and 8 seconds but have only used the default so far. The inertia knob on my Tx-22's are actually timed throttle increases which do not change the 'on chip' inertia. There could be some interesting combinations there!

I use inertia on my Air Porter loco and it makes movement much more realistic I think. Instead of the motor just stopping when you turn down the throttle, there is a 'soft stop' if you will. I like it.
I need to experiment more with all the settings on the transmitter.

Bob, I expect models to have a much higher power to weight ratio than full size trains so can benefit from some electronic aids...

1. The Inertia setting in the Rx does what I expect a flywheel to do which is to dampen speed changes in a short timescale. If you have both then both are having an effect.

2. The Inertia control on the Tx simulates train 'mass' which slows down speed changes over a larger timescale (up to 1 minute with center off motor control). The instructions for your product will tell you if you have this control.

3. BEMF reduces the need for operator skill/finess to control stiction and wheelslip. My Rx do not have BEMF but do have a minimum start power setting which perhaps falls into this category.
Regards, David.

So changing the Inertia setting causes the speed to ramp up/down in a 0 to 8 second time frame.

The MIN voltage (Start Power) setting can be set so there's 0 to MAX volts on the motor as soon as it is turned on.

The reason I'm asking is I have 1 or 2 engines where I have to turn the throttle knob almost 40 degrees to get the engine to move, and at that point it suddenly starts moving, quicker than I would like. My other engines (different brand than the 2 in question) start to move at around 20 degrees of turn of the knob.

It may be due to some binding (in which case changing settings probably won't help) and I'll take a look into that. It could also be the gear ratio, my engines with higher ratios (like my Williams brass 4-8-4, 43:1) start off smoothly with a very small turn of the knob.

I may want to change the MIN start voltage first, then play with the Inertia setting.

The 2 engines in question have their engines mounted at an angle with the engine mount screwed to the chassis. The screws may be too tight and causing binding between the gear/worm on the motor shaft and the gearbox. I may loosen them up a bit first and see what happens.

I have found that different motors have a lot different starting characteristics. My Air Porter starts so beautifully, I can make it start so slow you have to set stakes to see it going. My Little Mine loco has a different type of motor, one of the old HO locomotive motors. It doesn't like to get going slowly. I'll have to look into the settings on the Rx for it I guess.